Add a more robust plugin config system.

2010-11-20: Luke Shumaker <lukeshu@sbcglobal.net>
Add a more robust (but backward compatible) plugin config system
 * lib/util.php: add common_config_section($main), as a companion to common_config($main,$sub)
 * lib/statusnet.php:
    Functions for other Places:
      - add public static pluginFiles($name) which returns a list of all possible filenames a plugin with $name could be defined in.
      - addPlugin(...): use self::pluginFiles(...) instead of a hard-coded list.
    Actual Functionality:
      - add public static getPlugins() which returns
          array_merge(
            common_config('plugins','default'),
            common_config_section('plugin-list')
          )
      - use self::getPlugins() instead of common_config('plugins','default')
    Robustness:
      - handle plugins that have a type other than "array" or "null" for parameters without bugging out
 * actions/pluginenable.php: (in order of in the file):
    - use StatusNet::getPlugins() instead of common_config('plugins','default')
    - check if a plugin exists, not whether it is loaded (uses newly added StatusNet::pluginFiles(...))
    - Also save to 'plugin-list' (the new plugin system), in addition to 'plugins' (the old plugin system)

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